C# - How To Create Custom Controls Containing Populated Lists

Sep 11, 2011

How to properly create custom controls containing populated lists?For example: I need a combobox control which contains a list of products, then I would reuse this control in other project.

[Code]...

and it works but when I run the project each item is duplicated - this is because list is populated twice. First when user add a control to form, second by designer when project is started.I already found a solution to prevent adding items in edit mode, but this is not what I need. I would like to have them existing in edit mode so they could be edited at this point.

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How To Create Custom UI / Controls

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I would like to expand my knowledge of VB.NET and was looking at creating custom user interfaces or custom controls. The type of things I am thinking of is: [URL]s. How are those controls created? I imagine it involves using the existing controls in Visual Studio as a starting point, and altering them to suit your design?

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Can someone point me in the direction of a good tutorial on creating and building custom controls that can be added to the Toolbox?

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Mar 18, 2011

I have a form with a datarepeater that contains various controls (i.e. datetimepickers, text boxes, combobox) that are populated via a binding source. I also have other controls on the form that are not part of the data repeater. I would like to force validating all controls after the data is populated. I have successfully forced validating the non-datarepeater controls using Me.ValidateChildren() at the end of my load event. However, it does not fire the validating events for the controls within the data repeater. I have unsuccessfully tried many different attempts to set and move focus within the datarepeater controls trying to get the validating events kicked off. I am not sure where would be the best place (e.g. in drawItem? in ItemCloned?) to place the code and what it should be exactly.

Here was my latest attempt:
Private Sub DataRepeater1_DrawItem(ByVal sender As Object, ByVal e As Microsoft.VisualBasic.PowerPacks.DataRepeaterItemEventArgs) _
Handles DataRepeater1.DrawItem
For i = 0 To e.DataRepeaterItem.Controls.Count - 1
e.DataRepeaterItem.Controls.Item(i).Focus()
e.DataRepeaterItem.Controls.Item(0).Focus()
Next

I successfully handled the validating events in the data repeater caused by user input errors. However, I have the unusual situation that the data coming into my form is already bad for some of the controls. The purpose of the form is to validate the data coming in to it and from user-input. I am newbie with vb.net.

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Controlling The Order Of Controls Being Populated On A Form In VB 2008?

Jul 29, 2011

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Somehow the datagrid is getting populated, even before the form_load event is triggered. I need the listbox to be populated before the datagrid is populated, but I have no idea how to control this.

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How To Dynamically Create Array Lists

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I have to retrieve same amount of datas from a variable number of clients in an arraylist. I know I can put arraylists in arraylists but would be easier to get one arraylist for each client dynamically declared.

Ex: alClients (XXX, YYY, ZZZ)
for i as integer = 0 to clientsNumber -1
Dim nameVariable = "al"+ alClients(i) ' = alXXX
Dim nameVariable as New arraylist()
...
Next

But it seems not to be possible to do that so is there a way to do it? By surcharging constructor of the Class New ArrayList(), ok but how??

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How To Create A Popup Dialog With Lists Of Arrays

Mar 17, 2010

I was wondering how you create a form with three lists. Each list representing a different array.

I guess the question is how do you take an array and make it into a list so it shows up on a list box?

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[code]...

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Dec 29, 2011

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know how to create a custom file association ( a custom extension ) in VB .Net and how to open it on the application

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I wish to read a web page that had various frames and div elements.To start with I would like to create a routine that justs lists all of those elements values and then display each element name and its value so I know what I have and how to reference it later on.I have been using the WebBrowser control and have managed to do a few basic things so far like go to a website and auto login.

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Sorting 2 Lists Based On Only One Of The Lists?

Apr 1, 2011

I have two lists. One list is a list of names, the other list is a list of how many times each name is found in the first list noted in the database

so...
Nick
John
Jim
Jack

is the firs tlist

10
13
13
2

is the second list. Nick had 10, john 13 and so on.I want to sort the second list from large to small, but have the index for the first list still linked to the correct amount of calls.i do it this way so I can

for x = 0 to num_of_names
string = lst_name(x) & "-" & lst_count(x)
next x

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With VB.net, I'm coding a simple application to get more used to the new .Net format.

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Is there a method in installation to associate the file type with the new program? How can i check when the program loads if a database file has been 'double-clicked' (rather than just running from the .exe of the program) and proceed to load the data?

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So what I tried is:(all of this is on MDI Forms)

For Each frm as CustomForm in Main.MdiChildren If frm.MyName = calledBy Then 'this part is just to know which form called the form to create the object For Each cntrl as CustomTextBox in frm.Controls'DO Something
Next End if Next

Now.. if the first control is a custom ComboBox it thorws an error since it sees that it does not match the custom TextBox control..how do i get around this? By my understanding it should just go through all of the controls on the said form and just check those who match CustomTextBox control ?

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Arguments For Custom Controls?

Nov 24, 2011

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Resizing And Custom Controls?

Dec 10, 2010

I'm not going to post my code for my transparentlistbox class, but here is a link to it.It's been working fine as is, until early this morning when I tried to set a different size.[URl]..For the longest time I placed a normal listbox control on a form and resized that, setting a new public variable of transparentlistbox to the same size/location as the original listbox, setting the visibility of the original to false, and adding the transparentlistbox to the form (me.controls.add).It looked like this:

[Code]...

Now, since I've moved some buttons around on my main form, I resized the original listbox control to be wider (same height though). When I tested, the transparentlistbox (code didn't change still set to original listbox size/location), the size was that of what I had the original listbox set to, before resizing?

So, I commented out all of the custom drawing/paint events/etc I could find for the transparentlistbox and tested, still stuck to the original size. I stepped line by line debugging and verified that transparentlistbox1.size=listbox1.size indeed matched the new resized size (but didn't actually resize)?

Last I did was comment out the transparentlistbox.visible and put back the listbox1.visible and listbox1 does indeed show with the new resized size? I'm not quite sure what to test next?

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Use SVG In .net To Draw Custom Controls?

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Is there a way to use SVG in vb.net to draw custom controls? Or any other way?

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Is it possible to have a custom control (inherits from Control) and add sub-controls to it (like, a label for example)? Basically I want a composite control. I know controls can contain other controls, but if I try to add a control to MyBase.Controls, this doesn't work because that's readonly.

[Code]...

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Custom Controls - .net Inherits 2 Classes?

Jan 16, 2012

inherit from two classes in VB.net?We are developing Custom User Controls that inherits from say System.Web.UI.WebControls.Label. We are planning on implementing a bunch of these controls but they will share mostly the same additional properties. We are hopeful about centralising these properties.I have looked into interfaces but it seems they only 'contract' properties you need to implement.

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Custom Controls Disposing & Memory?

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I've been working on a few large custom controls, and I noticed that when I use them, my memory starts ballooning. If I add a control at runtime, it increases the memory, but when I remove the control, it decreases less than it increased. However, it would stop balooning at some higher value. So if go back in forth between pages (which adds and removes the control), the memory would look something like this:

1,000K|5,000K|4,000K|9,000K|8,000K... 20,000K|25,000K|21,000K|25,000K|21,000K|25,000K... etc I know it takes a while for the GC to run, but the memory would stay consistantly high for long periods of time.

I tried writing a Closing routine, where when I called it, the control looped trhough its children and disposed all the internal controls, which seemed to help a little, but the memory after running the control and disposing was still much higher than before running the control. I also use custom event addhandlers. Should I remove all these as well. It would be nice if I received a little guidance on this.

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Handling Focus With Custom Controls?

Nov 3, 2011

I have a custom control I'm creating. When I click on it, it draws a dotted border and puts some nubs on it for resizing. This all works perfectly. Now I want it so when I click off of it, it deselects. I already have a variable to set up if it's selected or not and subs to draw/clear it. I just have to be able to detect when something else is selected or it gets clicked off of.

What I've Tried

My first and best solution to this was to use the LostFocus event, but, by custom control apparently won't let it fire. After some research, as far as I know, custom controls don't have Focus events because they are custom and could be changed (basically, you have to implement the focus events yourself).

My Question

Does anybody have a solution to either implement the focus events or a way to handle off clicking for custom controls?

Sources

Here is my controls current source:

Imports System.Drawing.Drawing2D
Public Class wDOMElement
Inherits Control

[Code]....

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